I've gone through a process of upgrading my TT's over the last 2 years, and seemingly every time I make an adjustment or swapped equipment (ie Tables, Arms, Cart's, Pre's) had similar issues surface. Here's some of the problems I've encountered:
first the easy problems that can be solved with repositioning and or cleaning connections -
1) Poor interconnect cable connection between preamp and phono pre. Poor ground connection - on preamp, on table, or on the arm.
2) poor cartridge lead connection (between cart and arm)
3) Table in too close proximity to preamp. Be careful not to position your preamp close to and directly above or below your table.
Now the harder problems -
4) bad ground post on my preamp (yes, the assembly at the factory was incorrect).
5) Bad Cartridge - I had to send it back for warranty service on a ground connection.
6) 60hz feedback from motor to cartridge - some cart's are susceptible to this. My Grado Sonata just did not like being mounted on my Heybrook TT2. The closer the cart got to the center spindle (and the motor), the louder the hum got. This is a problem only with 120V motors. 12VDC motors shouldn't be a problem.
7) Bad wiring inside the tonearm (this is a problem with buying a used tonearm) - had to be re-wired.
I also found that some cartridges are much harder to get quieted down, while others are easy. And finally, as Pbb indicates, expect more noise than you're use to with cd player.
first the easy problems that can be solved with repositioning and or cleaning connections -
1) Poor interconnect cable connection between preamp and phono pre. Poor ground connection - on preamp, on table, or on the arm.
2) poor cartridge lead connection (between cart and arm)
3) Table in too close proximity to preamp. Be careful not to position your preamp close to and directly above or below your table.
Now the harder problems -
4) bad ground post on my preamp (yes, the assembly at the factory was incorrect).
5) Bad Cartridge - I had to send it back for warranty service on a ground connection.
6) 60hz feedback from motor to cartridge - some cart's are susceptible to this. My Grado Sonata just did not like being mounted on my Heybrook TT2. The closer the cart got to the center spindle (and the motor), the louder the hum got. This is a problem only with 120V motors. 12VDC motors shouldn't be a problem.
7) Bad wiring inside the tonearm (this is a problem with buying a used tonearm) - had to be re-wired.
I also found that some cartridges are much harder to get quieted down, while others are easy. And finally, as Pbb indicates, expect more noise than you're use to with cd player.